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构建分子进化树的UPGMA方法是加权分组平均方法的简称
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我们观察到两序列间的核苷酸替换数就是两序列在长期进化过程中的实际核苷酸替换数
Match the pictures to the sentences which best describe them.1 Mateo shows Hector and Mr. Sanchez a tie.2 Hector and Mr. Sanchez are shopping for clothes.3 Mr. Sanchez asks them what they think about the shirt.4 Mateo tells Hector what his job is.
Watch the video. Fill in the table.ItemRegular price.Sales price
Watch the video again. Use words in the boxes to complete the conversation.word bank: shirt. size. price. large. dollars.Hector: Ten (1). I’ve never bought a tie before. Is that the usual price?Mateo: Well, the normal (2)is $18. You save $8 per tie.Hector: In that case, I’ll get two—a blue one and a red one. Now all I need is a(3).Mateo: What (4)do you wear?Hector: I usually wear medium. But sometimes I wear a (5). It all depends on the shirt.
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